Delta is adding suites with lie-flat beds and sliding doors on long-haul flights.

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The battle among airlines to win over the big-spending business traveler intensified last week, with Delta Air Lines announcing a business-class section of private suites on long-haul flights.

Delta’s plan to roll out its so-called Delta One section on the carrier’s new A350 jets, starting next year, comes a couple of months after United Airlines unveiled its Polaris business-class section, with podlike suites and lie-flat beds on international flights.

The latest upgrades are prompted by several changes in the industry, including a surge in airline profits over the last few years because of lower fuel costs and a series of mergers that reduced competition for domestic flights.

“The airlines now have some money burning a hole in their pockets,” says Rick Seaney, chief executive of the travel website Farecompare.com.

A trade group for the nation’s airlines has reported that the average profit margin for the country’s top airlines was 14.1 percent in 2015, or 14.1 cents on every dollar of revenue, nearly on par with the average for major U.S. corporations of 16.5 percent.

So it makes sense that the airlines would invest some of those profits to keep or expand their appeal to business travelers, who generate the lion’s share of airline revenue.

U.S.-based airlines also are buying new planes and installing more luxurious seats to respond to the expansion of foreign carriers, such as Etihad and Emirates, which began years ago to fly out of the U.S. equipped with ultra-luxury amenities such as private suites and onboard showers and cocktail lounges, Seaney says.

The business-class sections for Delta and United both offer seats with direct access to the aisle that convert to lie-flat beds that stretch to 6 feet 6 inches. Delta has an 18-inch television monitor, while United offers a 16-inch screen. Both also have specially made bedding, mood lighting and power outlets.

The key difference is that Delta’s suites will be equipped with sliding doors for ultimate privacy while United’s pods are open to the aisle but display a glowing “do not disturb” sign when passengers want to be left alone.